EP0085728B1 - Procédé pour le broyage de minerais de titane pour exalter le rendement du dioxyde de titane - Google Patents

Procédé pour le broyage de minerais de titane pour exalter le rendement du dioxyde de titane Download PDF

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Publication number
EP0085728B1
EP0085728B1 EP19820100910 EP82100910A EP0085728B1 EP 0085728 B1 EP0085728 B1 EP 0085728B1 EP 19820100910 EP19820100910 EP 19820100910 EP 82100910 A EP82100910 A EP 82100910A EP 0085728 B1 EP0085728 B1 EP 0085728B1
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EP
European Patent Office
Prior art keywords
ore
titanium dioxide
titaniferous
recovery
polyol
Prior art date
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Expired
Application number
EP19820100910
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German (de)
English (en)
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EP0085728A1 (fr
Inventor
Gerard Martin Sheehan
Donald Edward Knapp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wyeth Holdings LLC
Original Assignee
American Cyanamid Co
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Publication date
Application filed by American Cyanamid Co filed Critical American Cyanamid Co
Priority to EP19820100910 priority Critical patent/EP0085728B1/fr
Priority to DE8282100910T priority patent/DE3271092D1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/06—Selection or use of additives to aid disintegrating
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B34/00—Obtaining refractory metals
    • C22B34/10—Obtaining titanium, zirconium or hafnium
    • C22B34/12—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08
    • C22B34/1204—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08 preliminary treatment of ores or scrap to eliminate non- titanium constituents, e.g. iron, without attacking the titanium constituent

Definitions

  • This invention relates to a method for improving the grinding of titaniferous ores and increasing the amount of recovery of titanium dioxide from said ores.
  • the first step in the sulfuric acid process for recovery of titanium dioxide from titaniferous ores is to grind the ore to a desired particle size.
  • the ore is digested with sulfuric acid to yield a digestion cake which consists essentially of water-soluble sulfates of titanium and iron, as well as minor impurities.
  • the recovery of titanium can be determined by comparing (a) the titanium assay and weight of the ore to (b) the titanium assay and volume of the resulting solution.
  • the sulfuric acid process for preparing titanium dioxide from titaniferous ores is conducted on a large scale and thus, even a small increase in the recovery of titanium dioxide can be commercially important. For example, for a 25 ton batch of titaniferous ore containing 64.6% titanium dioxide, a change in the titanium dioxide recovery from 84.5% to 89% represents a 29% decrease in unrecovered, or wasted titanium dioxide, and 1400 pounds extra titanium dioxide actually recovered. So, any increase in the efficiency of comminution of a titaniferous ore will result in a worth-while saving even though the unit saving may appear small.
  • Canadian Patent No. 962,003 discloses the application of propane diol to pigmentary titanium dioxide, following its preparation by either of the well known sulfuric acid or chloride processes, to improve the dispersibility characteristics of the pigment, particularly in paints; and U.S. Patent No. 3,076,719 describes a treatment of similarly produced titanium dioxide pigment with a polyol of from 4 to 10 carbon atoms which prevents clumping during storage.
  • U.S. Patent No. 2,822,241 discloses the addition of a glyceride, particularly a monoglyceride, to a titaniferous ore containing organic flotation agents to improve the digestion of the ore in sulfuric acid.
  • the present invention provides as a major object a method whereby the comminution of titaniferous ores may be conducted more efficiently, with the use of certain polyols, so that the recovery of titanium dioxide from said ores upon digestion may be enhanced. Further objects and advantages of the invention will become apparent from the description of the invention which ensues.
  • the polyols used in the method of the present invention have the formula: wherein R is alkyl (C,-C 4 ), or hydroxyalkyl (C,-C 4 ) containing up to 3 hydroxy groups, and wherein R' is alkylene (C,-C 3 ).
  • R is alkyl (C,-C 3 ) and R' is methylene.
  • R is ethyl and R' is methylene.
  • the polyols are preferably stable and wettable in concentrated sulfuric acid at ambient temperatures (25°C, to 35°C.), but tend to be less stable at the digestion reaction temperature.
  • Suitable such compounds include trimethylolpropane, 1-hydroxy-2,2-dimethylolpropane; 1-hydroxy-2,2-dimethylol- pentane; 1-hydroxy-3,3-diethylolpentane; 1,3-dihydroxy-2,2-dimethylolbutane, and pentaerythritol.
  • the polyol is added to the titaniferous ore in an amount effective to improve the comminution thereof. Generally this amount will be from about 0.005% to about 2% by weight of the ore, desirably from about 0.05% to about 1 %, and preferably from about 0.07% to about 0.5%. However, more of the polyol may be added if so desired.
  • the comminution is rendered more efficient and the ultimate recovery of titanium dioxide from the ore, upon digestion thereof in sulfuric acid, is enhanced.
  • the polyol appears to act as an anti-caking agent for the ore during comminution, resulting in a more rapid reduction of ore particle size.
  • the smaller particles are believed to be better wetted by the sulfuric acid, thereby yielding a higher recovery of titanium dioxide.
  • the continued presence of the polyol in the sulfuric acid digestion medium apparently further augments the recovery of titanium dioxide from the ore.
  • TMP trimethylolpropane
  • a typical chemical assay of this Florida ore which is weathered beach sand, reveals hat the titanium dioxide content thereof is 64.6%.
  • a 1500 g. sample of the ore was first dried at 110°C. to less than 0.2% water and then placed in a gallon ball jar containing 7500 g. of 2.54cm (1 inch) steel balls.
  • the ball jar was rotated at 53 rpm for the lengths of time shown in Table I below.
  • the ball jar was emptied and the ore particle size determined on a 100 g. sample by sifting in a.Tyier Ro-Tap through a bank of sieves ranging from 100 to 325 mesh (0.147 to 0.043 mm) (Tyler-U.S. Standard) for 30 minutes.
  • Table 1 demonstrates that for grind times of 30 minutes and 360 minutes, more -325 mesh (0.043 mm) particles were produced when TMP in an amount of 0.1 % was added to the ore. For this procedure, regular commercially used steel balls, which were not polished, were employed..
  • This example shows the improvement in titanium dioxide recovery when a titaniferous ore which was ground using a polyol as a grinding aid is digested with sulfuric acid.
  • the method used in this example closely approximates the industrial digestion process, so the results received here are representative of results which would be expected on an industrial scale.
  • Example 2 four separate 1000 g. samples of the titaniferous ore comminuted for equal times as in Example 1, two samples with, and two samples without, the addition of 0.1 % TMP, were wetted with 98% sulfuric acid for 30 minutes. Each mixture of ore and sulfuric acid was then heated to 115°C. over periods ranging from 19 to 31 minutes, while 60 ml. of water was added to simulate the dilution which occurs in the industrial process when high pressure steam (2.76 bar) (40 psig) is introduced into the mixture. End liquor, i.e., the mother liquor which remains after the titaniferous liquor is hydrolyzed to yield titanium dioxide, was then added to achieve the desired ratio of sulfuric acid to basic oxides in the ore.
  • End liquor i.e., the mother liquor which remains after the titaniferous liquor is hydrolyzed to yield titanium dioxide
  • the end liquor contained about 20% sulfuric acid, and a sufficient quantity was added so that after the valences of all other recoverable sulfatable ore components had been satisfied, there remained enough sulfuric acid to satisfy between 65 and 80% of the titanium valences with sulfate ions.
  • the samples were digested in the acid solution at temperatures of about 180 ⁇ 190°C. for about 2 1/2 hours. Thereupon, the resulting digestion cakes were dissolved in water to form a titaniferous liquor which was analyzed for titanium dioxide content, and the results compared with the analysis of the original ore, to determine the titanium dioxide recovery.
  • the determination of recovery can be made using any well known method, e.g., reduction of the titanium (IV) to titanium (III) with zinc amalgam and titration of the reduced titanium with ferric ammonium sulfate to a thiocyanate end-point.
  • Example 1 The procedure of Example 1 is repeated, except that the trimethylolpropane is replaced by an equal weight amount of 1-hydroxy-2,2-dimethylolpropane; 1-hydroxy-2,2-dimethylolpentane; 1-hydroxy-3,3-di- ethylolpentane; 1,3-dihydroxy-2,2-dimethylolbutane, and pentaerythritol.
  • Example 1 The procedure of Example 1 is repeated, except that trimethylolpropane in amounts equal to 0.005%, 0.05%, 0.5%, 1% and 2% is added to the ore.

Claims (5)

1. Procédé visant à améliorer la pulvérisation d'un mineral titanifère, qui consiste à ajouter audit mineral un polyol répondant à la formule:
Figure imgb0005
dans laquelle R est un groupe alkyle (C1―C4) ou hydroxyalkyle (C1―C4) contenant jusqu'à trois groupes hydroxy et dans laquelle R' est un groupe alkylène (C1―C3), en une quantité efficace pour réduire la dimension particulaire du minerai conséquemment à la pulvérisation.
2. Procédé selon la revendication 1, dans lequel R de la formule R-C+R'OH)3 est un groupe alkyle (C1―C4) et R' de ladite formule est le groupe méthylène.
3. Procédé selon la revendication 1, dans lequel le polyol est le triméthylolpropane.
4. Procédé selon la revendication 1, dans lequel le polyol est présent en une quantité représentant d'environ 0,005% à environ 2% en poids du minerai.
5. Procédé selon la revendication 1, dans lequel le polyol est présent en une quantité représentant d'environ 0,05% à environ 1% en poids du minerai.
EP19820100910 1982-02-09 1982-02-09 Procédé pour le broyage de minerais de titane pour exalter le rendement du dioxyde de titane Expired EP0085728B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19820100910 EP0085728B1 (fr) 1982-02-09 1982-02-09 Procédé pour le broyage de minerais de titane pour exalter le rendement du dioxyde de titane
DE8282100910T DE3271092D1 (en) 1982-02-09 1982-02-09 Improved grinding of titaniferous ores to enhance recovery of titanium dioxide

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19820100910 EP0085728B1 (fr) 1982-02-09 1982-02-09 Procédé pour le broyage de minerais de titane pour exalter le rendement du dioxyde de titane

Publications (2)

Publication Number Publication Date
EP0085728A1 EP0085728A1 (fr) 1983-08-17
EP0085728B1 true EP0085728B1 (fr) 1986-05-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (2)

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EP (1) EP0085728B1 (fr)
DE (1) DE3271092D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1243646A (fr) * 1984-12-04 1988-10-25 William K. Kodatsky Methode de traitement des reactifs de desulfuration a base de carbure, a injecter dans le fer en fusion
EP0840105A1 (fr) * 1996-11-05 1998-05-06 Orbisphere Laboratories Neuchatel Sa Procédé et appareil spectroscopique

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2822241A (en) * 1953-08-17 1958-02-04 Nat Lead Co Digestion in sulphuric acid of titaniferous ore concentrates containing organic flotation agent
NL259274A (fr) * 1960-09-15
US3549091A (en) * 1968-03-14 1970-12-22 Nat Lead Co Fluid energy milling tio2 pigment
US3758322A (en) * 1971-07-21 1973-09-11 American Cyanamid Co Rutile tio2 slurries

Also Published As

Publication number Publication date
EP0085728A1 (fr) 1983-08-17
DE3271092D1 (en) 1986-06-19

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